Abstract
Yusho blood and control serum were colleced in around 1991 and analyzed for congeners of PCDDs, PCDFs and PCBs. In Yusho blood, TEQ was mainly contributed by 2,3,4,7,8-penta-CDF (77–248 ppt), 1,2,3,4,7,8-hexa-CDF (15–37 ppt) and 2,3,3′,4,4′,5-hexa-CB (16–77 ppt). Total TEQ in Yusho blood (185–441 ppt) was only 3–14 times higher than that of control serum (31–61 ppt). It is notable that the concentrations of 3,3′,4,4′,5-, 2,3,3′,4,4′- and 2,3′,4,4′,5-penta-CBs in Yusho blood were comparable to or lower up to 3–5 times than those in control blood.
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